arch/arm64: Compile arm-trusted-firmware with coreboot timestamp

Update ATF codebase to a version that supports passing a timestamp and
fix the format to what it accepts now (including quotes).

This provides reproducible builds.

Change-Id: I12a0a2ba1ee7921ad93a3a877ea50309136ab1ab
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: https://review.coreboot.org/13726
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

1 files changed, 0 insertions, 0 deletions

diff --git a/3rdparty/arm-trusted-firmware b/3rdparty/arm-trusted-firmware
-Subproject 649591bbabbc737534943136751722307429b7d
+Subproject 4a9663062cef254e79189e4fbde85172eb58f9c